Drill bit depth minder

Abstract

The present invention relates to a device that is hand held and independent of a drill, either hand held or powered by electricity. This device consists of a tubular housing with a turn screw plunger shaft and a scale for measurement in inches on one side and metric on the other side of a liner window opening on one side of said tubular housing The user selects the depth of the hole to be drilled, sets the turn screw to that depth as indicated on the outside scale. The leading end of a drill bit is then inserted in the receiving end opening in the tubular housing that is opposite to the turn screw plunger. Thereafter, a collar with a set screw is placed over the flat end of the bit and secured by the set screw to the bit at the receiving end wall of the device of the present invention. The bit, on which the set screw collar is secured, may then be inserted in any type of drill and when used will drill only to the depth of the collar as measured and set by the device of the present invention.

What is claimed is: 
     
       1. A device to limit a drill bit's entry to a predetermined depth into material which comprises an elongated body with a thumb screw attached to one end of a threaded rod, said body adapted to threadably receive said threaded rod on one end of said body, a stop disk fitted to another end of said threaded rod, an opening on another end of said elongated body, an elongated opening on a side of said body wherein said thumb screw is adapted to turn in order to set said stop disk at a predetermined depth as shown on at least one scale adjacent to said elongated opening on said body, a stop collar adapted to receive a drill bit therein, said stop collar adapted to become adjacent to said opening on said another end of said elongated body so that said drill bit can engage a face of said stop disk to allow a set screw to position said stop collar to a measured depth on said drill bit. 
     
     
       2. The device of claim 1 wherein said scale is in English measurements. 
     
     
       3. The device of claim 1 wherein said scale is in Metric measurements. 
     
     
       4. The device of claim 1 wherein said stop collar is attached to said drill bit and said stop collar is adapted to stop drilling at a predetermined depth.